Inferential statistics

Which hypothesis is one-tailed?

• Null hypothesis

• Directional hypothesis

• Non-directional hypothesis

• Experimental hypothesis

What 3 factors determine which statistical test will be done?

• type of hypothesis, significance level, N

• Nominal, ordinal and interval

• Test of difference/correlation, experimental design, level of measurement

• Test of difference/correlation, significance level, experimental design

What is the significance level used in Psychology?

• 0.05

• 0.5

• 0.1

• 0.01

What is a type 2 error?

• Where the first hypothesis is accepted incorrectly, should have accepted the null

• Where the first hypothesis is accepted incorrectly, should have accepted neither hypothesis.

• Where the null hypothesis is accepted incorrectly, should have accepted neither hypothesis.

• Where the null hypothesis is accepted incorrectly, should have accepted the first hypothesis

What is one reason why psychologists use a 0.05 level of significance?

• Because it is the most strict level of significance.

• Because it is the least strict level of significance

• Because psychologists can never use the whole population in their research

• Because it allows the researcher to accept their hypothesis

Why would a researcher be likely to make a type 1 error?

• Because they used a significance level that is too high

• Because they chose the wrong statistical test

• Because they calculated the test incorrectly

• Because they used a significance level that is too low

What is the rule of R for a Pearson's test?

• The observed value must be equal to or less than the critical value

• The observed value must be equal to or more than the critical value

• The critical value must be equal to or less than the significance level

• The observed value must be equal to or less than the significance level

How do we know which critical value to use?

• Type of hypothesis, experimental design, significance level

• Type of hypothesis, experimental design, level of measurement

• Test of difference/correlation, experimental design, significance level

• Type of hypothesis, N, significance level

What level of measurement is the most precise?

• Interval

• Nominal

• Qualitative

• Ordinal

Which experimental design is unrelated?

• Lab experiment

• Field experiment

• Independent measures

• Repeated measures